fix: update changelog for account group naming inconsistency fix

Clarified the changelog entry to include a reference to the related pull request (#6601) that addresses the account group naming inconsistency caused by using alphabetical sorting instead of the actual groupIndex. This ensures accurate sequential numbering across wallets.

Author: fabiobozzo

packages/account-tree-controller/CHANGELOG.md

@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
-- Fix account group naming inconsistency where entropy groups used alphabetical sorting instead of actual groupIndex, causing incorrect sequential numbering across wallets
+- Fix account group naming inconsistency where entropy groups used alphabetical sorting instead of actual groupIndex, causing incorrect sequential numbering across wallets ([#6601](https://github.com/MetaMask/core/pull/6601))
 
 ## [0.13.1]
 

packages/account-tree-controller/src/AccountTreeController.ts

@@ -329,7 +329,7 @@ export class AccountTreeController extends BaseController<
 
       // Calculate group index for default naming
       let groupIndex: number;
-      
+
       // For entropy-based multichain groups, use the actual groupIndex from metadata
       // instead of calculating from alphabetical sort position
       if (group.type === 'multichain-account' && 'entropy' in group.metadata) {